oracle 查看对象空间信息

--1、表空间大小
-- 估算1
Select Tablespace_Name, Sum(bytes) / 1024 / 1024
From Dba_Segments
Group By Tablespace_Name
order by Sum(bytes) / 1024 / 1024 desc;

--2、表占用空间
select segment_name, sum(bytes) / 1024 / 1024 Mbytese
from user_segments
where segment_type = 'TABLE'
group by segment_name
order by segment_name;
Select Segment_Name, Sum(bytes) / 1024 / 1024
From User_Extents
Group By Segment_Name
order by Sum(bytes) / 1024 / 1024 desc;

--3、索引占用空间
select segment_name, sum(bytes) / 1024 / 1024 Mbytese
from user_segments
where segment_type = 'INDEX'
group by segment_name
order by segment_name;

--4、数据文件使用情况
select a.tablespace_name,
round(a.bytes / 1024 / 1024, 0) "总空间",
round((decode(b.bytes, null, 0, b.bytes)) / 1024 / 1024, 0) "使用空间",
round((decode(b.bytes, null, 0, b.bytes)) / a.bytes * 100, 1) "使用率",
c.file_name,
c.status
from sys.sm$ts_avail a, sys.sm$ts_free b, dba_data_files c
where a.tablespace_name = b.tablespace_name(+)
and a.tablespace_name = c.tablespace_name
order by a.tablespace_name;

---使用情况2
select b.file_id 文件ID,
b.tablespace_name 表空间,
b.file_name 物理文件名,
b.bytes / 1024 / 1024 大小M,
c.max_extents / 1024 / 1024 可扩展数M,
b.bytes / 1024 / 1024 + c.max_extents / 1024 / 1024 总大小M,
trunc((b.bytes - sum(nvl(a.bytes, 0))) / 1024 / 1024) 　已使用M,
trunc(sum(nvl(a.bytes, 0)) / 1024 / 1024) 　剩余M,
trunc(sum(nvl(a.bytes, 0)) / (b.bytes) * 100, 2) 　剩余比
from dba_free_space a, dba_data_files b, dba_tablespaces c
where a.file_id = b.file_id
and b.tablespace_name = c.tablespace_name
group by b.tablespace_name,
b.file_name,
b.file_id,
b.bytes,
c.max_extents,
b.bytes / 1024 / 1024 + c.max_extents / 1024 / 1024
order by b.file_id;

--5、表空间使用统计
select a.tablespace_name,
a.bytes / 1024 / 1024 "Sum MB",
(a.bytes - b.bytes) / 1024 / 1024 "used MB",
b.bytes / 1024 / 1024 "free MB",
round(((a.bytes - b.bytes) / a.bytes) * 100, 2) "percent_used"
from (select tablespace_name, sum(bytes) bytes
from dba_data_files
group by tablespace_name) a,
(select tablespace_name, sum(bytes) bytes, max(bytes) largest
from dba_free_space
group by tablespace_name) b
where a.tablespace_name = b.tablespace_name
order by ((a.bytes - b.bytes) / a.bytes) desc;
--表空间大小估算2
select a.tablespace_name,
round(a.s,2) "CURRENT_TOTAL(MB)",
round((a.s - f.s),2) "USED(MB)",
f.s "FREE(MB)",
round(f.s / a.s * 100, 2) "FREE%",
g.autoextensible,
round(a.ms,2) "MAX_TOTAL(MB)"
from (select d.tablespace_name,
sum(bytes / 1024 / 1024) s,
sum(decode(maxbytes, 0, bytes, maxbytes) / 1024 / 1024) ms
from dba_data_files d
group by d.tablespace_name) a,
(select f.tablespace_name, sum(f.bytes / 1024 / 1024) s
from dba_free_space f
group by f.tablespace_name) f,
(select distinct tablespace_name, autoextensible
from DBA_DATA_FILES
where autoextensible = 'YES'
union
select distinct tablespace_name, autoextensible
from DBA_DATA_FILES
where autoextensible = 'NO'
and tablespace_name not in
(select distinct tablespace_name
from DBA_DATA_FILES
where autoextensible = 'YES')) g
where a.tablespace_name = f.tablespace_name
and g.tablespace_name = f.tablespace_name order by "FREE%";

--准确计算表空间大小
SELECT F.TABLESPACE_NAME,
A.ALL_TOTAL "总空间",
A.ALL_USED "总使用空间",
A.ALL_TOTAL - A.ALL_USED "总剩余空间",
(A.ALL_TOTAL - A.ALL_USED) / A.ALL_TOTAL * 100 "总剩余比例",
A.TOTAL "当前大小",
U.USED "当前使用空间",
F.FREE "当前剩余空间",
(U.USED / A.TOTAL) * 100"当前使用比例",
(F.FREE / A.TOTAL) * 100 "当前剩余比例"
FROM (SELECT TABLESPACE_NAME,
SUM(BYTES / (1024 * 1024 * 1024)) TOTAL,
SUM(DECODE(AUTOEXTENSIBLE, 'YES', MAXBYTES, BYTES) /
(1024 * 1024 * 1024)) ALL_TOTAL,
SUM(USER_BYTES) / (1024 * 1024 * 1024) ALL_USED
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) A,
(SELECT TABLESPACE_NAME, SUM(BYTES / (1024 * 1024 * 1024)) USED
FROM DBA_EXTENTS
GROUP BY TABLESPACE_NAME) U,
(SELECT TABLESPACE_NAME, SUM(BYTES / (1024 * 1024 * 1024)) FREE
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F
WHERE A.TABLESPACE_NAME = F.TABLESPACE_NAME(+)
AND A.TABLESPACE_NAME = U.TABLESPACE_NAME(+)
ORDER BY (A.ALL_TOTAL - A.ALL_USED) / A.ALL_TOTAL,F.FREE / A.TOTAL ASC;